Rotor for magnetos



Aug. 27, 1929. c. F. RElS RoToiz FOR MAGNETOS Filed June '7, 1927 'l 45 metal.

- Patented Aug. 27, 1929.

' UNITED, STATES PATENT OFFICE.

CUB! I. RI'JIS, OF CHICAGO, ILLINOIS, ASSIGNOR 'IO WESTERN IGNITION 00., OF

\ CHICAGO,

rumors.

' Application filed June 7,

10 the present type it is usual to employ a.

circular plate or disc which is attached to the free end of the magnet or magnets for the purpose of furnishing a support for the shaft and for centering the pole pieces. 16 These plates are usually of screws or the like. Such structures are objectionable, in-that the screws sometimes become loose, thereby permitting the disc to become detached or partly so, with the- .2 result that the mechanism is partly disrupged if not entirely destroyed.

prior'types of magnetos the rotor pole pieces are usually formed integrally with the hub or boss of the rotor and thus necessitate the special construction of the entire rotor if the number of, poles is to be varied or if their thickness is to be increased P or decreased for the pur ose of varying the strengthof the magnetic eld. 7 so It is an object of the present invention to eliminate the objectionable features of -ma eto 'rotors as above referred to, and tiiis end the pole pieces, instead of being integrally iormed on the base or hub portion, are separately formed and then assembled. Furthermore, the use of a plate or disc secured to the free ends of the pole pieces is obviated by employing astructure m which the shaft is cast integrallyv with 40 a portion of the rotor structure.

A further object of the invention resides in the construction of a rotorhaving a' perfect balance due to the fact thatin its -final form it consists of asolid mass of Other objects and advantages of the invention will be a parent from the followingdescription -w en considered in 'connecattached by means '1927. 8erla1 No. 197,214.

the rotor, the shaft being shown partly in sectlpn and partly in side elevation.'

Figure 3 is a transverse section taken on line 3-3 of Figure 2 and looking in the direction of the arrows.

Figure 4 isa plete device, an

Figure 5. is a view showing the laminations employed in the rotor structure.

Referring to the drawing .in greater do (perspective view of the comtail, the numeral 1 indicates the base or buttof the magnet, and consists ofa thick dlsc of magnetic material, such as hard.

steel, provided with a centrally disposed I 2 which is formed" of bronze, brass or other non-magnetic material.

aperture .for the reception of a drive shaft The rotor may be provided with any number of poles and the pole pieces may vary in cross sectional area to suitdifferent installations. In the present embodiment of the invention four poles are illustrated and the pole pieces 3, also composed of magnetic material, are properly spaced about the base I 1 by means of pins 4, each provided with a shoulder5 for a purpose to appear hereinaften- For the purpose of reducing edd currents and increasing the permeabihty 0 this ortion of the magnetic field the pole pieces are provided with laminations' of soft iron,

These laminations are or steel. dicated in Figures 1 clearly in- 3 and 5, and it will pole piece being be observed that they completely encircle I the poles e and, in order to prevent from a point about midway of the length of the pole pieces to'the free ends laminations 6 are fitted on the poles between the I 'tio with the accompanying drawing, in fthe south poles) from the shoulder 5 for \arate formed be assembled.

parts of the rotor ready to Figure 2 is alongitudinal section through Figure l-is a perspective view of two sep= ends of-the poles, and then several of the laminations 6 are The'n'orth poles carry laminations' 6 fromthe Shoulder'fi to the point where the duabout one-third of thedistance to the free I plaeedon these same poles. l

\ poured in to plxlaminations 6 on the south poles end. The remaining ends ofthe north poles are then fitted with duplex laminations 6 and the south poles with lamiiiations 6.

- It will now be clear that the south poles are connected by laminations 6 from shoulder 5 to a point approximately onethird of the distance to the free ends of the pole pieces and then for a simlar distance both sets of poles carry laminations 6. The remainder of the north pole pieces are then covered by laminations 6 and the south poles by laminations 6. Magnetic leakage between the unlike poles is reduced to an unobjectionable amount by a proper choice of the number of" laminations 6 which are inserted between the two sets of connecting laminations.

In constructing that part of the rotor comprising the drive shaft and the laminations the latter are assembled in a mold with the proper cores, and molten brass or bronze is form the shaft 2 and the webs 9 which are to be positioned between the pole pieces 3. This material upon solidifying fixedly secures the laminations to the webs 9 and to the shaft 2. The webs 9 are molded with the longitudinally-extending grooves 10 which receive ribs 11 formed on the sides of the pole pieces 3 to aid the pins ft in securing the pole pieces against the action of centrifugal force.

' In assembling the rotor, threads 12 are first formed on the end of the shaft 2 and the latter passed between the polepieces 3 and through the aperture in base 1, the bronze webs 9, of course, taking positions between the poles and the laminations 6 and 6 encircling the ends of the poles. A nut 13 is then threaded onto the end of the shaft 2,

thereby drawing the parts tightly together and bringing the laminations into close contact with the shoulders 5 on the pole pieces. This construction provides "a rotor of substantially solid metal and comprising the desired number of poles separated by webs of non-magnetic metal and provided with laminations secured in position by connectors located within the contour of the rotor itself. Obviously a rotor so composed will be perfectly balanced due to the fact that it is composed of a solid mass of metal of cylindrical form. p

From the foregoing description it will be apparent that I have devised a novel type of rotor which may be readily fabricated, and

' which, due to the manner of attaching the poles, may be varied to suit varying require ments. Furthermore, it will be observed that by the constructiondisclosed herein the many disadvantages of a separate plate hereinbefore referred to are avoided.

In accordance with the pat ent statutes, I have described what I now believe to be the best embodiment of theinvention, but I. (.10

not wish to be understood thereby as limiting myself or the scope of the invention, as many changes and modifications may be made without departing from the spirit of the invention; all such I aim to include in the scope of the appended claims.

What I claim as new and desire to secure byLetters Patent is:

netic base plate, a plurality of spaced pole pieces secured to said plate, laminations encircling a portion of said pole pieces, and a mass of cast non-magnetic metal intimately uniting said laminations.

2. A rotor for magnetos comprising a magnetic base plate, a plurality of spaced pole pieces secured to said plate, laminations encircling said pole pieces, a non-magnetic.

shaft, and a'mass of non-magnetic material intimately securing the laminations to the shaft.

.3. A rotor for magnetos including a base.

plate, a shaft, a plurality of webs integral with said shaft and positioned between said pole pieces,laminations encircling the ends of the pole .pieces and connecting the like poles, and means for securing said shaft to said base plate.

5. A rotor for magnetos including a base plate, pole pieces connected to said plate, a shaft, a plurality of webs integral with said shaft and positioned between said pole pieces, and a tongue and groove connection between said pole pieces.

6. In a rotor including a base plate and a plurality of pole pieces, a shaft of nonmagnetic metal, integrally formed longitudinal webs on said shaft, and a plurality of sets of metallic laminations secured to said .webs and shaft and encircling the ends of said pole pieces.

7. In a rotor including a base plate and a plurality'of pole pieces, a shaft of nonmagneticmetal, integrally formed longitudinal webs on said shaft, a plurality of sets of laminations of magnetic material secured to said webs and shaft and encircling the ends of said pole pieces, and rigid connections between certain of said sets of lamina- 1. A rotor for magnetos including a mag-.

tions, said connections passing through said i shaft.

8. A rotor for magnetos including a base plate, pole pieces connected to said plate, a

shaft of nonmagnetic metal, integrally formed longitudinal webs on said shaft, a plurality of sets of laminations of soft metal secured to said webs and shaft, said shaft being passed through said base plate with h the webs disposed between said pole pieces and the sets of laminations encircling said pole pieces, and means for drawing said aminations into snug engagement with said pole pieces.

9. A rotor for magnetos comprlsing a circular base plate of magnetic material, a plu- 10 rality of spaced pole pieces magnetically connected to one face of said plate, the diametrically 0 posed pole pieces being of like polarity, laminations encircling the ends of said pole pieces and rigidly connecting the ends of the like poles, a shaft composed of non-magnetic metal, and a mass of non-magnetic metal intimately uniting said laminations with said shaft. I

10. A rotor for magnetos comprising a circular base plate of magnetic material aving an opening therein, a plurality of spaced pole pieces secured to one face 0" said plate around said opening, a plurality of stacks of laminations havm openings therein, a shaft of non-magnetic material carrying spaced integral webs intimately secured to said stacks of laminations, and means for securing said laminations in fixed relation about said pole pieces when said shaft is inserted in the opening in said base plate with the webs between the pole pieces.

11. A rotor for magnetos including a base plate, a lurality of pole pieces about said plate an .in contact therewith, laminations of magnetic material encircling said pole 35 pieces, certain of the laminations of opposed pole pieces being integrally eonnecte CURT F. REIS. 

